Nightmare is nothing more than the Ultimate Evil. He is the Boss of the N.M.E., (Night Mare Enterprises). N.M.E.
started long ago when he sent monsters down to planets to conquer them. Once he got to a certain planet, a planet with
bunch of fierce warriors, a dangerous battle arose. Near the end of the battle, there was only one warrior left, he goes
by the name of Sir Meta Knight. And now N.M.E. creates monsters and sell them to people who do not know their true
purpose, like King Dedede. But, he created one monster, however that did not obey him. His name was Kirby. He fears it could
destroy all of Nightmare Enterprises.